Am a big fan of all the features that even the free version of Cloudflare has to offer, I mean you can turn off caching while you are testing some stuff, clear out the cache in existing machines, easy ass SSL setup with https enforcing, DDOS protection, inbuilt analytics [not as extensive as google analytics but gets the job done], auto minifies code, mobile site redirection, a lot of add on apps, IP masking and a ton of other features that I don't use